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struct sockaddr_in web; /* 服务器 */
char request[1024] = {'\0'}; /* 客户端发送的请求报文内容 */
char recvbuf[4096] = {'\0'}; /* 客户端接收的内容 */
char sessionid[40] = {'\0'}; /* 获取JSESSIONID */
FILE *fd;
memset(&web, 0, sizeof(web));
web.sin_family = AF_INET; /* ipv4 */
web.sin_port = ntohs(PORT);
web.sin_addr.s_addr = inet_addr(SERVER_IP);
s = socket(PF_INET, SOCK_STREAM, 0); /* socket */
if (s == -1)
bail("socket(1)"); /* 错误处理函数 */
c = connect(s, (struct sockaddr *)&web, sizeof(web));
if (c == -1)
bail("connect(1)");
s = socket(PF_INET, SOCK_STREAM, 0);
c = connect(s, (struct sockaddr *)&web, sizeof(web));
memset(request, 0, 2048);
strcat(request, "POST /check/checkuser.jsp HTTP/1.1\r\n");
strcat(request, "Accept: text/html\r\n");
strcat(request, "Referer: ");
strcat(request, "Accept-Language: zh-cn\r\n");
strcat(request, "Content-Type: application/x-www-form-urlencoded\r\n");
strcat(request, "Accept-Encoding: gzip, deflate\r\n");
strcat(request, "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Maxthon)\r\n");
strcat(request, "Host: 59.xx.xx.xx:xx\r\n");
strcat(request, "Content-Length: 63\r\n");
strcat(request, "Connection: Keep-Alive\r\n");
strcat(request, "Cache-Control: no-cache\r\n\r\n");
strcat(request, "username=liuby&userpw=MIMA&usertype=student&Submit=%B5%C7%C2%BD");
// printf("%s\n,%d\n", request,strlen(request));
z = send(s, request, strlen(request), 0); /* send */
recv(s, recvbuf, 4096, 0); /* 接收 */
get_sessionid(recvbuf); /* 获取sessionid */
/* 此时接收到的报文显示为302 Moved Temporarily，这种一般需要再次发送请求GET需要跳转到的网页，不知道我这样理解对不对，完全是根据这次做的来猜测的 */
memset(request, 0, 2048);
strcat(request, "GET /check/students/stulogin1.jsp?username=liuby&usertype=student HTTP/1.1\r\n")");
/* 根据抓包分析和JSESSIONID，再次构造要发送到服务器的报文 */
close(s); /* 关闭连接,如果要再次请求，重新建立socket,connect,send等 */
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